Search results
Results from the WOW.Com Content Network
A beta decay mode has been found for all other astatine isotopes except for 212-216 At and their isomers. [5] [1] Among other isotopes: astatine-210 and the lighter isotopes decay by positron emission; astatine-217 and the heavier isotopes undergo beta decay; and astatine-211 decays by electron capture instead. [5]
Astatine is a chemical element; it has symbol At and atomic number 85. It is the rarest naturally occurring element in the Earth's crust, occurring only as the decay product of various heavier elements. All of astatine's isotopes are short-lived; the most stable is astatine-210, with a half-life of 8.1 hours.
This page was last edited on 23 January 2021, at 05:47 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
1 astatine-198m: 1.0 mendelevium-246: 1.0 thorium-224: 1.05 sodium-26: 1.077 plutonium-228: 1.1 mendelevium-247: 1.12 curium-246m: 1.12 bohrium-271: 1.2 thorium-215: 1.2 radium-208: 1.3 radium-207: 1.3 rutherfordium-268: 1.4 hassium-268: 1.42 polonium-217: 1.47 astatine-218: 1.5 lawrencium-253m: 1.5 fermium-259: 1.5 dubnium-260: 1.52 dubnium ...
[2] [3] [a] Like iodine, astatine has been shown to adopt odd-numbered oxidation states ranging from −1 to +7. The chemistry of astatine is "clouded by the extremely low concentrations at which astatine experiments have been conducted, and the possibility of reactions with impurities, walls and filters, or radioactivity by-products, and other ...
Number of isomers including stereoisomers [3] [5] Molecular Formula Name of straight chain Synonyms 1 1 1 CH 4: methane: methyl hydride; natural gas 2 1 1 C 2 H 6: ethane: dimethyl; ethyl hydride; methyl methane 3 1 1 C 3 H 8: propane: dimethyl methane; propyl hydride 4 2 2 C 4 H 10: n-butane: butyl hydride; methylethyl methane 5 3 3 C 5 H 12 ...
Organoastatine chemistry describes the synthesis and properties of organoastatine compounds, chemical compounds containing a carbon to astatine chemical bond. Astatine is extremely radioactive, with the longest-lived isotope (210 At) having a half-life of only 8.1 hours. Consequently, organoastatine chemistry can only be studied by tracer ...
The compound with the formula (C 5 H 5) 2 Fe 2 (CO) 4 exists as three isomers in solution. In one isomer the CO ligands are terminal. When a pair of CO are bridging, cis and trans isomers are possible depending on the location of the C 5 H 5 groups. [7] Another example in organometallic chemistry is the linkage isomerization of ...